AU540865B2 - Wide aperture objective lens - Google Patents

Wide aperture objective lens

Info

Publication number
AU540865B2
AU540865B2 AU76593/81A AU7659381A AU540865B2 AU 540865 B2 AU540865 B2 AU 540865B2 AU 76593/81 A AU76593/81 A AU 76593/81A AU 7659381 A AU7659381 A AU 7659381A AU 540865 B2 AU540865 B2 AU 540865B2
Authority
AU
Australia
Prior art keywords
lens
objective lens
disc
laser beam
relatively large
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU76593/81A
Other versions
AU7659381A (en
Inventor
Ramalinga Reddy Chirra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Discovision Associates
Original Assignee
Discovision Associates
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Discovision Associates filed Critical Discovision Associates
Publication of AU7659381A publication Critical patent/AU7659381A/en
Application granted granted Critical
Publication of AU540865B2 publication Critical patent/AU540865B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Optical Head (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

An objective lens comprising five lens elements and intended for use in an optical recording system wherein a laser beam is focused onto a recording surface located beneath a plastic layer over the disc. The disclosed lens has a relatively large numeric aperture of 0.75, but has a relatively large working distance between the lens and the disc and a relatively low total mass, to facilitate rapid movement of the lens. In addition, the lens is color corrected to accommodate a range of spectral frequencies present in the laser beam.
AU76593/81A 1980-10-31 1981-10-19 Wide aperture objective lens Ceased AU540865B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202841 1980-10-31
US06/202,841 US4368957A (en) 1980-10-31 1980-10-31 Wide aperture objective lens

Publications (2)

Publication Number Publication Date
AU7659381A AU7659381A (en) 1982-05-06
AU540865B2 true AU540865B2 (en) 1984-12-06

Family

ID=22751479

Family Applications (1)

Application Number Title Priority Date Filing Date
AU76593/81A Ceased AU540865B2 (en) 1980-10-31 1981-10-19 Wide aperture objective lens

Country Status (8)

Country Link
US (1) US4368957A (en)
EP (1) EP0051282B1 (en)
JP (1) JPS57104914A (en)
KR (1) KR830008187A (en)
AT (1) ATE15110T1 (en)
AU (1) AU540865B2 (en)
CA (1) CA1142005A (en)
DE (1) DE3171937D1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8135821U1 (en) * 1981-12-09 1986-01-02 Dieter Gräßlin Feinwerktechnik, 7742 St. Georgen Multi-range switching device
US5272568A (en) * 1991-12-11 1993-12-21 Eastman Kodak Company High aperture finite conjugate lens system
US5258777A (en) * 1991-08-23 1993-11-02 Eastman Kodak Company Thermal printer system with a high aperture micro relay lens system
US5274503A (en) * 1991-08-23 1993-12-28 Eastman Kodak Company High aperture finite conjugate lens system suitable for use as a micro relay lens
US5257136A (en) * 1991-12-23 1993-10-26 International Business Machines Corporation Reverse telephoto agron objective lens
US5311496A (en) * 1992-11-13 1994-05-10 Hyundai Electronics America Achromatic expansion prism for magneto-optical drive
TW239211B (en) * 1993-04-02 1995-01-21 Hyundai Electronics America Electromagnetic lens actuator for optical disk drive
US5662591A (en) * 1995-05-26 1997-09-02 The Johns Hopkins University Apparatus for exercising and measuring strength of a patient's limb and an adjustable pivot clamp
WO2009061153A2 (en) * 2007-11-08 2009-05-14 Microptics Co., Ltd. 5 pieces camera lens
US8920407B2 (en) * 2009-07-29 2014-12-30 Alcon Lensx, Inc. Optical system for ophthalmic surgical laser

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6049287B2 (en) * 1977-09-13 1985-11-01 オリンパス光学工業株式会社 Playback lens for video discs
JPS5476170A (en) * 1977-11-29 1979-06-18 Olympus Optical Co Ltd Lens for video disc
JPS54127339A (en) * 1978-03-27 1979-10-03 Olympus Optical Co Ltd Condensing lens for video discs
JPS5526545A (en) * 1978-08-17 1980-02-26 Olympus Optical Co Ltd Reproducing lens for video disc
US4256374A (en) * 1979-04-02 1981-03-17 Mca Discovision, Inc. Write and read objective lens for high density storage

Also Published As

Publication number Publication date
US4368957A (en) 1983-01-18
DE3171937D1 (en) 1985-09-26
EP0051282A2 (en) 1982-05-12
ATE15110T1 (en) 1985-09-15
JPS57104914A (en) 1982-06-30
CA1142005A (en) 1983-03-01
EP0051282A3 (en) 1982-12-01
EP0051282B1 (en) 1985-08-21
KR830008187A (en) 1983-11-16
AU7659381A (en) 1982-05-06

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